气候变化领域集成服务门户(CCPortal): Effect of precipitation regime on delta D values of soil n-alkanes from elevation gradients - Implications for the study of paleo-elevation

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DOI	10.1016/j.orggeochem.2011.03.019
	Effect of precipitation regime on delta D values of soil n-alkanes from elevation gradients - Implications for the study of paleo-elevation
	Bai, Yan; Fang, Xiaomin; Gleixner, Gerd; Muegler, Ines
通讯作者	Fang, XM (通讯作者)
发表日期	2011
ISSN	0146-6380
EISSN	1873-5290
起始页码	838
结束页码	845
卷号	42 期号:7
英文摘要	We measured delta D values of long chain n-alkanes isolated from 30 surface soil samples along two elevation transects on the Tibetan Plateau differing in precipitation regime and water source. The East Asian Monsoon precipitation dominates the wetter regime on the eastern slope (from 1230 to 4300 m) of Gongga Shan on the eastern Tibetan Plateau. Precipitation from the Polar Westerlies dominates the drier region on the slope from 1900 to 5000 m in the West Kunlun Shan on the northwestern Tibetan Plateau. The decrease in delta D value with elevation in the wetter region greatly exceeded that in drier region by, -1.9 +/- 0.1 parts per thousand/100 m and -1.4 +/- 1.0 parts per thousand/100 m respectively. The apparent fractionation between leaf wax and precipitation epsilon(wax-p) values in the wetter region (ca. -164 parts per thousand) were more negative than those in drier region (ca. -125 parts per thousand above 3200 m). We also measured delta D values in leaves of six common living trees (values from -287 parts per thousand to -193 parts per thousand) from Gongga Shan, ranging from about 2900-4200 m. The abundance-weighted average values of the n-alkanes (delta D-wax) show a strong reverse correlation with sample source elevation (R-2 0.78 for soils from Gongga Shan; R-2 0.85 for soils from West Kunlun Shan above 3200 m), suggesting that n-alkane delta D-wax faithfully records the precipitation delta D and that the isotopic altitude effect of precipitation controls delta D-wax altitudinal gradients in the mountains. The data show a fairly strong monotonic dependency of n-alkane delta D values on elevation for the eastern Plateau, but a complex relationship between n-alkane delta D values and elevation for the northwestern Plateau. The delta D-wax values at sites below 3200 m from the Kunlun Shan area exhibit an unexpected positive correlation with elevation. The study confirms the potential for using sediment delta D-wax values to reconstruct paleo-elevation in wetter regions, but suggests caution in applying the approach to dry regions. Our results also show it is essential to consider the intricacy of the pattern of atmospheric circulation and water sources and their influence on the lapse rate of delta D values with elevation. (C) 2011 Elsevier Ltd. All rights reserved.
关键词	ISOTOPE-BASED PALEOALTIMETRY LEAF WAXES TIBETAN PLATEAU D/H RATIOS CLIMATE PLANT TERRESTRIAL UPLIFT VARIABILITY GONGGA
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000294359500014
来源期刊	ORGANIC GEOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257914
推荐引用方式 GB/T 7714	Bai, Yan,Fang, Xiaomin,Gleixner, Gerd,et al. Effect of precipitation regime on delta D values of soil n-alkanes from elevation gradients - Implications for the study of paleo-elevation[J]. 中国科学院青藏高原研究所,2011,42(7).
APA	Bai, Yan,Fang, Xiaomin,Gleixner, Gerd,&Muegler, Ines.(2011).Effect of precipitation regime on delta D values of soil n-alkanes from elevation gradients - Implications for the study of paleo-elevation.ORGANIC GEOCHEMISTRY,42(7).
MLA	Bai, Yan,et al."Effect of precipitation regime on delta D values of soil n-alkanes from elevation gradients - Implications for the study of paleo-elevation".ORGANIC GEOCHEMISTRY 42.7(2011).